1 // Copyright 2019 Google LLC.
2 // Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
3 #include "tools/fiddle/examples.h"
4 REG_FIDDLE(Canvas_MakeRasterDirectN32, 256, 256, true, 0) {
draw(SkCanvas *)5 void draw(SkCanvas* ) {
6 const int width = 3;
7 const int height = 3;
8 SkPMColor pixels[height][width]; // allocate a 3 by 3 Premultiplied bitmap on the stack
9 // create a SkCanvas backed by a raster device, and delete it when the
10 // function goes out of scope.
11 std::unique_ptr<SkCanvas> canvas = SkCanvas::MakeRasterDirectN32(
12 width,
13 height,
14 pixels[0], // top-left of the bitmap
15 sizeof(pixels[0])); // byte width of the each row
16 // write a Premultiplied value for white into all pixels in the bitmap
17 canvas->clear(SK_ColorWHITE);
18 SkPMColor pmWhite = pixels[0][0]; // the Premultiplied format may vary
19 SkPaint paint; // by default, draws black
20 canvas->drawPoint(1, 1, paint); // draw in the center
21 for (int y = 0; y < height; ++y) {
22 for (int x = 0; x < width; ++x) {
23 SkDebugf("%c", pixels[y][x] == pmWhite ? '-' : 'x');
24 }
25 SkDebugf("\n");
26 }
27 }
28 } // END FIDDLE
29